How to read the band →
Solid line = floor (spellings that unambiguously belong to the group). Shaded band up to the dashed edge = ceiling (the most it could reach if every ambiguous spelling counted here).
Bristol
Bristol has stayed fairly steady in American naming for generations. All-time it's been given to 11,616 U.S. babies, the 1,031st most common name by sound today, peaking at 801 in 2019, with 390 in 2025.
Bristol has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).